Drill-holder



H. W. LIGHTNEH.

DRILL HOLDER.

APPLICATION FILED FEB. 24, 1920.

1,382,003, a MM June 21, 1921'.

H. W. LIGHTNER.

DRILL HOLDER.

APPLICATION FILED $55.24, 1920.

Q/z/ner 2 SHEETS-SHEET 2 Patented June 21 UNITED STATES PATENT OFFICE.

HENRY W. LIGHTNER, OF GRAND RAPIDS, MICHIGAN, ASSIGNOR TO WILMARTH 8aMORMAN COMPANY, OF GRAND RAPIDS, MICHIGAN, A CORPORATION OF MICH- IG N.

DRILL-HOLDER.

To all whom it may concern:

Be it known that I, HENRY W. LIGHTNER, a citizen of the United States ofAmerica, residing at Grand Rapids, in the county of Kent and State ofMichigan, have invented certain new and useful Improvements inDrill-Holders; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to drill holders and is directed to a holder fordrills which may be applied to a grinding machine to hold a drill inrelation to the grinding wheel of the machine for properly grinding saiddrill. lVith certain types of drills grinding the same after the lengthof the drill has been diminished from long use and many grindings isdiflicult and almost impossible. Withmy invention not only is itpossible to ind the drill to the limit of its use as a drill but withthe same holder all lengths of drills from the shortest possible drillto the longest used may be held in the holder for grinding. My inventionconsists of many novel details of constructionfor effectivelyaccomplishing this end, namely, the holding of drills irrespective oftheir. lengths and the holding of drills particularly of very shortlength and up to thelimit of use of the drill. Various other objects andpurposes together with novel constructions for attaining the same willappear as understanding of the invention is had from the followingdescription taken in connection with the accompanying drawings, inwhich;

Figure 1 is a side elevation of the drill holder in its operativerelation to a grinding wheel.

Fig. 2 is a side elevation of the front end of the drill holder.

'Fig. 3 is a transverse section through the drill holder and showing arear elevation of the adjustable intermediate supporting member of thedrill holder.

Fig. 4 is a plan of the drill holder,said intermediate drill holdermember being removed.

Fig. 5 is a front elevation of a novel form of tail block used with thedrill holder.

Fig. 6 is a front elevation of the drill holder and showing it swungover from the vertical for clearance of a drill held therein,

and

V Specification of Letters Patent.

Patented June 21, 1921.

Application filed February 24, 1920. Serial No. 361,035.

Fig. 7 is a side elevation of the front end of the drill holder, theintermediate drill support being removed therefrom.

Like reference characters refer to like parts. in the different views ofthe drawings.

The holder is adapted for use-in connection with a grinder which, inconstruction, may comprise a supporting post 1 at the upper end of whicha shaft 2 is rotatably mounted and adapted to be driven. by a beltaround a pulley 3 on the shaft. A grinding wheel 1 is fixed at one endof and turns with the shaft.

A rod 5 is fixed to and extends from the post 1 on which a bracket 6. isadjustably mounted to turn about the axis of said rod; said bracket isequipped with any suitable means for holding. it in any position towhich it may be adjusted. An arm 7 is mounted on the bracket, being.provided at ts inner end with a cylindrical post 8 which extends into. abearing formed. at the upper end of the bracket 6. The axis of this"post is inclined .to the vertical. Tliecupper end of arm 7 is equippedwith a seat 9 concaved on its upper side against which the lower eonvexside of bar 10 of the drill holder rests. By turning the screw 11 saidbar 10 may be swung from one side to the other, thus changingtheposition of the drill holding device carried on said bar relative to thegrinding wheel and giving proper clearance therefor. The drill holdermay be clamped to any position to which it may be adjusted by tighteningthe clamping nut 9.

The main supporting portion of the drill holder comprises the lower bar10 p from which, at, itsforward end, two integral angularly disposedwings 12 extend upwardly being located at angle to each otherand makinga V-shaped trough or seat for the front end of the drill. Two brackets13 project laterally from bar lO adjacent opposite ends of said bar andserve as a support for a rod 14 which is disposed between them. Anintermediate support for the drill comprising two angularly positionedwings 15 is adjustably mounted on the rod 14 an integral boss 16extending from the lower part of said intermediate support and beingbored to pass freely over rod 14. This intermediwardly about the axis ofthe rod 14: and moved to an inoperative position. Normally, when inoperative position it is held against accidental movement by a springcatch 15 which engages with the bar 10 as shown in Fig. 3.

, A bracket 17 is adjustably mounted to be moved lengthwise of the bar10 and serves as a support to carry a tail block 18. Said block issecured at the forward end of a rod 19 which may be adjusted back andforth through the bracket 17 by turning a suitable hand wheel 20connected therewith. The lower end 18 of the block 18 is pointed hav inginclined sides cut on the same angle as the inner sides of the drillsupporting members 12 and 15. At the upper end of the block 18 lug 21projects forward through which a threaded rod 22 passes connecting witha drill shank rest 23. From the lower end of the part 23 of the rest atrough shaped member 2% extends forward. This shank rest is slidablymounted in the front side of the block 18 and may be adjusted todifferent positions by operating the nut 25 threaded onto the rod 22.

At the front edge of one side 12 of the for ward drill support a plate26 is connected, the same being adjustable to a plurality ofdifiz'erentpositions; A number of upper and lower slots 27 are cutthrough the plate at different angles and are secured to the forwardedgeof one side 12 by means of screws 28 passing through the slots. Thisplate serves to support the point or lip of the drill while it is beingground and by adjust ng the same to different positions any'size ofdrill and any kind either flat or twist drills, may

- be properly ground.

' In practice a drill of considerable length may be placed in the two\l-shaped seats 12 and 15 and the end of the shank thereof rest in therest 24: which, being mounted. on the tail block, may be moved forwardto any desired position and likewise moved up or down to any desiredposition. Many types of drills have an enlarged collar between the shankand the operating portion of the drill and said collar may be locateddirectly against the rear edges of the sides 15 of the intermediatedrill supporting member. When-a drill becomes worn'and shortened the setscrew which holds the intermediate supporting member in position on rod14 is loosened and said intermediate supporting member swung to oneside, whereupon the drill may be heldin the forward support only andbetween it and the tail block. From the construction it is possible toproperly support every type of drill which is to be, ground and thisirrespective of the length of the effective portion of the drill. Adrill holderof the character described is particularly useful with.drills which have intermediate enlarged collars. The entire length ofthe drill may be used and it is not necessary to imperfectly grind thesame by hand or discard them when the drill has shortened beyond acertain point. The construction is relatively simple and is particularlyeffective for the proper grinding of drills.

I claim: r

1. A drill holder for use in grinding drills, comprising a bar providedat one end with a V-shaped upwardly extending. drill rest formed by twoangularly positioned sides, a rod mounted lengthwise and to one sideofthe bar, a second V-shaped rest slidably and rotatably mounted on therod and adapted to be positioned above the bar in alinement with thefirst V-shaped rest, and a tail block adjustably mounted on and abovethe bar back of the second rest, substantially as and for the purposesdescribed.

2. A drill holder for use in grinding drills; comprising a bar formed atone'end with an upwardly extending V-shaped drill rest, a secondV-shaped drill rest normally located back of the first rest, and meansfor mounting said second rest alongsideof the bar for adjustmentlengthwise thereof or for lateral movement to inoperative position awayfrom the bar, substantially as described. I

3. A drill holder for use in grinding drills, comprising a bar formed atone end withan upwardly projectingV-shaped rest, a rod mounted at oneside of and parallel with the bar, and a second V-shaped rest adjustablymounted on the rod and adapted to be moved lengthwise thereof or turnedoutwardly about the axis of the rod, said second rest being adapted tobe turned to operative position directly back of and in alinement withthe first rest, substantially as described.

4. A drill holder for use in grindingdrills, comprising a bar, anintegral V-shaped drill rest located at and extending above the frontend of the bar, two brackets projecting laterally from the bar at spacedapart points, a rod disposed between the brackets, and a second V-shapeddrill rest normally located 7 directly back of the first rest andprovided with a boss through which the rodpasses tail block adjustablymounted on and in front of the bracket to move toward or away from thebracket, a drill shank rest mounted in front of the tail block, andmeans for adjusting said; drill shank rest up and down with respect tothe tail block, substantially as described.

6. A drill holder for use in grinding drills, comprising an elongatedbar formed at its front end with an upwardly extending V- shaped drillrest, a bracket on the bar back of said rest, a tail block located infront of the bracket and formed with a V-shaped lower end, means formounting said tail block on the bracket for adjustment toward or awayfrom the bracket, a drill shank rest slid-ably mounted for verticalmovements on the front side of the tail block and including a forwardlyprojecting trough-shaped memher in which the end of a drill shank mayrest, and means for raising and lowering said drill shank rest withrespect to the tail block, substantially as described.

7. A drill holder for use in grinding drills, comprising an elongatedbar formed at its front end with an upwardly extending V- shaped drillrest, two spaced apart brackets extending laterally from the lower sideof the bar a short distance and thence turned upwardly, a rod locatedbetween the brackets in parallelism with the bar, a second V shapeddrill rest normally located above the bar back of the first rest, saidsecond rest being provided with an outwardly extending boss at its lowerportion through which said rod passes whereby the second rest may bemoved back and forth lengthwise of the rod or turned laterally away fromthe bar, and a yielding catch for holding the second rest in normaloperative position over the bar, substantially as described.

8. In combination with a grinding machine having a grinding wheel, asupport mounted on the grinding machine to turn about the axis inclinedto the vertical, a drill holder mounted on the support including anelongated bar located directly above the support, means for adjustingsaid bar with respect to the support to turn about a longitudinal axisparallel with and above the bar, a V-shaped drill rest located at thefront end of the bar in close proximity to the grinding wheel, a secondV-shaped drill rest mounted on the bar, means for mounting said seconddrill rest for movement lengthwise of the bar or for lateral turningmovement to an inoperative position at one side of the bar, and a tailblock mounted on and above the bar back of the second drill rest,substantially as described.

In testimony whereof I afiix my signature.

HENRY W. LIGHTNER.

